This plant rapidly grows wild on a planet and can colonise even rocky ground. 1000mu's is normally required to seed in a breathable planet (1mu per sector). After a year it is probable that the source can be tapped for building materials. The weekly change will be based on the area of sectors colonised (root) but will never be much greater than the width of the world.
The plant will generally interfere with native ecologies so should be used with extreme care although off-world species are often susceptible to defoliants (1mu per sector).